Preparation Of Rare Earth Ions Doped Phosphate Three - Dimensional Ordered Macroporous Materials And Study On Their Luminescent Enhancement

Rare earth ions doped three dimensional ordered macroporous(3DOM) material is a new kind of functional materials with periodic arrangement structure at nanoscales. On the one hand, it shares the characteristics of general 3DOM materials, such as high specific surface area, high porosity as well as uniform pore size distribution. On the other hand, it has unique optical properties for its structural periodical arrangement. Therefore, the luminescence properties of rare earth ions could be adjusted by its photonic bandgap properties, and the rare earth ions doped 3DOM materials could be applied to fabricate special light propagation as well as special sensors. As it has so many advantages, the rare earth ions doped 3DOM materials could be used in the fields of high efficiency LED devices, low threshold lasers and optical waveguide devices. But at present, the luminescence intensity of rare earth ions doped 3DOM material is weak, which deeply limits the application of rare earth ions doped 3DOM material. There are many defects on the surface of the structure of rare earth ions doped 3 DOM materials, and the absorption of rare earth ions is relative small, resulting in that the luminescence efficiency is very low. Thus, improving the luminescence intensity of rare earth ions doped 3 DOM materials plays an important role for its application. In this paper, rare earth ions doped phosphate 3 DOM luminescence materials have been fabricated and the luminescence intensity has been improved in many ways. And the mechanism of the enhancement of luminescence intensity has been investigated.In this paper, LaPO4:Eu3+3DOM materials have been fabricated by self-assembly template method combined with sol-gel process. And the influence of Ag nanoparticles with different concentration to the luminescence enhancement of LaPO4:Eu3+3DOM materials have been researched. By analyzing the experiment results, it could be found that the luminescence intensity of LaPO4:Eu3+ 3DOM materials could show a 3-fold enhancement after the addition of Ag nanoparticles. This enhancement was attributed to the surface plasmon resonance effect of Ag nanoparticles.In this paper, the influence of SiO2 with different thickness to the luminescence enhancement of LaPO4:Eu3+ 3DOM materials have been studied. According to the analysis of experiment results, it was found that the luminescence intensity of LaPO4:Eu3+ 3DOM materials could show a 3-fold enhancement after being coated by SiO2 layer. This enhancement comes from the modulation of SiO2 layer to the surface defects of LaPO4:Eu3+ 3DOM materials. In this paper, the influence of Ag nanoparticles to the luminescence of SiO2 coated LaPO4:Eu3+ 3DOM materials have been discovered. It can be found that the luminescence intensity of LaPO4:Eu3+ 3DOM materials was enhanced about 7 folds after being coated by SiO2 layer as well as being doped by Ag nanoparticles. In this paper, the influence of Li+ to the luminescence of LaPO4:Eu3+ 3DOM materials have been studied. By doping Li+ with different concentration, it could be found that the luminescence intensity of LaPO4:Eu3+ 3DOM materials could be enhanced after being doped with Li+, especially for the emission peak at 615nm, with a 17-fold enhancement obtained.In this paper, YbPO4:Er3+ 3DOM materials have been fabricated by self-assembly template method combined with sol-gel process. And the influence of Ag nanoparticles with different concentration to the upconversion luminescence enhancement of YbPO4:Er3+ 3DOM materials have been researched. By analyzing the experiment results, we found that the luminescence intensity of YbPO4:Er3+ 3DOM materials could show a 6-fold enhancement after the addition of Ag nanoparticles.In this paper, the influence of the SiO2 shell and Ag nanoparticles to the YbPO4: Er3+ 3DOM materials have been studied. By analyzing the results, it can be found that the upconversion luminescence intensity of YbPO4:Er3+3DOM materials could be enhanced with 10 folds after being coated by SiO2 shells. (2) The upconversion emission intensity of SiO2 coated YbPO4:Er3+3DOM-0.5 materials could get a further 5-fold enhancement after being doped with Ag nanoparticles. And a total 50-fold enhancement could be obtained.